G'day Greg

BMC changed from valves with wide rectangular collets to the narrow semicircular
collets around 1966. The collets have to fit the valves. Sounds like you need
a set of the narrow collets.

Both types have valve stem seals. The earlier version is a simple rubber
O-ring, next to useless. The later ones are an "umbrella" that sits around the
top of the valve guide. You need these late stem seals also.

avagoodday
Colin
www.SpriteParts.com.au

----- Original Message -----
From: gtmahney
To: spridgets-aus@yahoogroups.com
Sent: Sunday, July 05, 2009 10:12 PM
Subject: [spridgets-aus] Different Valve Stems





I was having trouble fitting the valve collets and the valve seals (the tiny O
rings) when it struck me why!

The valves I am using only have a single, narrow (<2mm) groove in them and not
the larger groove I've seen before and as are seen in the various workshop and
parts manuals.

Presumably these types of valves don't use a valve seal?? Is that right?? Are
they going to be more prone to leaking than (what I presume to be)the more
conventional type?

Thanks

Greg





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